问题描述：
3.Professor Black had us ____ compositions every Friday.
A.to write B.written C.write D.writing
为什么答案是C?我选D
4.My watch is broken; I must have it ______.
A.repairing B.to be repaired C.to be repairing D.repaired
为什么答案是D?不是有个have sth to do 的句型?
5.He has no alternative but ______ and ask for his brother for assistance.
A.go B.going C.is going D.to go
答案选D我选A 为什么?
A.to write B.written C.write D.writing
为什么答案是C?我选D
4.My watch is broken; I must have it ______.
A.repairing B.to be repaired C.to be repairing D.repaired
为什么答案是D?不是有个have sth to do 的句型?
5.He has no alternative but ______ and ask for his brother for assistance.
A.go B.going C.is going D.to go
答案选D我选A 为什么?
问题解答：
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